take a look at my list files
here (or, as a direct link,
here)
"000" is facing towards the screen (or "down"), and "007" is facing away from the screen (or "up"), so the hands facing "down" are:
xcom_0232 right arm (one-handed weapon)
xcom_0240 left arm (two-handed weapon)
xcom_0248 right arm (two-handed weapon)
xcom_0256 right arm (firing weapon)
and the hands facing "up" are 239, 247, 255 and 263, respectively